This question relates to the ancient Tamil classification of land divisions (Thinai) and the occupations of people living in those regions, as described in classical Tamil literature like the Tolkappiyam. - Marutam (A) corresponds to agricultural plains, inhabited by people engaged in ploughing and farming (Ploughmen - 3). - Kurinci (B) corresponds to hilly or mountainous regions, inhabited by hunters and gatherers (Hill people - 4). - Mullai (C) corresponds to pastoral tracts or forests, inhabited by pastoralists and those engaged in cattle rearing (Pastoralists - 1). - Neytal (D) corresponds to coastal regions, inhabited by fishermen and salt manufacturers (Fishing people - 2).